Patents by Inventor Chieh Kai KAO

Chieh Kai KAO has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for rate-distortion optimized transform and quantization through a closed-form operation
    Patent number: 9118918
    Abstract: The present invention is directed to a rate-distortion optimized (RDO) transform and quantization system. A frame classification unit classifies an input frame as either a key frame or a non-key frame. A rate model update unit generates at least one model parameter of a rate model according to a transform coefficient and a bitrate resulted from an encoded key frame. An RDO transform and quantization unit processes the input frame, thereby generating a quantized transform coefficient according to the model parameter. A frame buffer is used to store a previous frame, according to which the bitrate is estimated.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: August 25, 2015
    Assignee: National Taiwan University
    Inventors: Tsung Yau Huang, Homer H. Chen, Po-Yen Su, Chieh Kai Kao, Tao-Sheng Ou
  • RATE-DISTORTION OPTIMIZED QUANTIZATION METHOD
    Publication number: 20150131719
    Abstract: A rate-distortion optimized quantization method includes determining a rate model and a distortion model respectively, establishing a rate-distortion objective function according to the rate model and the distortion model, estimating a closed-form solution for the rate-distortion objective function, and according to an input frame generating quantized transform coefficients using the closed-form solution.
    Type: Application
    Filed: January 13, 2014
    Publication date: May 14, 2015
    Applicant: National Taiwan University
    Inventors: Tsung-Yau HUANG, Homer H. CHEN, Chieh-Kai KAO
  • RATE-DISTORTION OPTIMIZED TRANSFORM AND QUANTIZATION SYSTEM
    Publication number: 20130235938
    Abstract: The present invention is directed to a rate-distortion optimized (RDO) transform and quantization system. A frame classification unit classifies an input frame as either a key frame or a non-key frame. A rate model update unit generates at least one model parameter of a rate model according to a transform coefficient and a bitrate resulted from an encoded key frame. An RDO transform and quantization unit processes the input frame, thereby generating a quantized transform coefficient according to the model parameter. A frame buffer is used to store a previous frame, according to which the bitrate is estimated.
    Type: Application
    Filed: March 6, 2012
    Publication date: September 12, 2013
    Applicant: NATIONAL TAIWAN UNIVERSITY
    Inventors: Tsung Yau HUANG, Homer H. CHEN, Po-Yen SU, Chieh Kai KAO, TAO-SHENG OU